Is there way to prevent email address check on alert action?

We are using email addresses in custom properties.

We try to use general alert rule set where we utilize custom properties and variables when generating alerts.

Current general alert rules have been built before Orion Core was updated.

After update, rules must be edited through web interface.

I like web interface for building alert rules, but now I have hit to a wall when trying to use / edit rules.

When we are trying to use reply address with variable and fixed end string, editing does not allow it.

Is there any way to prevent this email validation check?